why volume of water increases instead of decreases when temprature of water reduces frm 4c to 0c?

Question

it is called anomalous expansion of water ?? but why it is so

Answer 1

Anomolous expansion of water ,i.e. The expansion between 4° and 0° is due to the formation of larger clusters in the water molecules.
Above 4°, thermal expansion sets in as thermal vibrations of the O—H bonds of water becomes more vigorous, tending to shove the molecules farther apart and water expands.
As a result of this water at 4°C is more denser than that at 0°C.This causes floating of ice on water during winter.Bursting of pipes is also due to anomalous expansion.

Answer 2

It is volume that increases and not density after 4 degree Celsius
this is because

At 4 °C, just above freezing, water reaches its maximum density, The physical reason for this is related to the crystal structure of ordinary ice, known as hexagonal ice Ih. Water, gallium, bismuth, acetic acid, antimony and silicon are some of the few materials which expand when they freeze; most other materials contract. It should be noted however, that not all forms of ice are less dense than liquid water. For example HDA and VHDA are both more dense than liquid phase pure water. Thus, the reason that the common form of ice is less dense than water is a bit non-intuitive, and relies heavily on the unusual properties inherent to the hydrogen bond.

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Answer 3

Water density increases from 0 C to 4 C. That makes water to be at least at 4 C, at the bottom of lakes, seas, etc., with ice in the surface, what makes possible the life in water and sea.
When water molecules goes from 4 to 0 they are forming groups in small lattices, what increases volumen and decreases density. When water ices, then all their mollecules are forming that lattice, as mineral cristals do, with the volume expanded and a less density.

This is unusual, but life has been possible thanks to that anomaly.

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Answer 4

Because it is human nature to do so. If the water is too hot, you will instinctively add cold in order to reduce the temperature. If the water is cold, you want to increase the temp, so you add hot. There are many other variables at work here as well that would actually have a bearing on your choice of which to add or subtract. Desired water pressure, Are both faucets on equally, The water heater temp. setting. You could nearly write a thesis on this. "The Psychology of Temperature Adjusting Decisions"

Answer 5

The bond between the water molecules loosens and space is created in between them. This makes the volume increase.

Answer 6

The volume of water does not increase per se, but the molecules of the water expands as it cools.

Answer 7

There is a graph about density vs volume for water expansion.
According this the density of water is equal 1 gr/cc at +4 c.Because of its property is doing this.

Answer 8

There are theories , mine is "Latent heat expands the molecules", reducing the density and increasing the volume.

Latent heat plays a major roll at phase change process.

Answer 9

due to anomalous expansion

Answer 10

water forms hydrogen bonding